SPAJ 111 C Sensitive Earth-Fault Relay User Manual

This document is the user manual and technical description for the SPAJ 111 C sensitive earth-fault relay, detailing its application as a neutral current measuring feeder earth fault relay, generator interturn fault protection, and capacitor bank unbalance protection. It covers the relay’s principle of function, including low-set and high-set definite time overcurrent stages, output relay configuration, serial communication, and technical data for installation and testing.